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Turtle one of the four groups of reptiles fossils of which can be traced for over 220 million years. Detachment contains about 328 nowadays grouped in 14 families and two suborders widespread in tropical and temperate climates almost throughout the world and the living both in water and on land. The hallmark is a turtle carapace consisting of two parts carapace and plastron. Carapace turtles is the main defense against the enemies.
The question of the origin still remains open. Conventionally they are considered the ancestors of Perm kotilozavry namely eunotozavry small like lizards animals with short and extra-wide ribs form a kind of dorsal shield. But it is believed that evolved from a special group of parareptilia descendants discosauriscus. The first known science turtle Odontochelys semitestacea appeared 220 million years ago in the Mesozoic era in the Triassic period. This was only the bottom half of the shell and in the mouth it had teeth which is not typical of modern turtles. Second ancient Proganochelys quenstedti already had a fully formed shell but in the mouth of her teeth were also present.
Of the 26 turtles known to science 12 families still exist today. There are many fossil turtles among which the largest tortoise were representatives of meiolania to carapace length of about 2.5 m. They were huge almost the same length with shell powerful tail bone lined by two rows of flattened spikes and the ends their triangular skulls placed blunt long horns backwards and sideways.
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